SECOND STAGE REGULATOR

Transcription

1 SECOND STAGE REGULATOR TAL 7012 (L) Rev. 1 MSA 2007 Prnt. Spec (I) Mat Doc

2 Firehawk Second Stage Regulator Assembly Second Stage w/hose Ass'y Push-To-Connect " Front " Rear Snap-Tite 42" Snap-Tite 24" Second Stage w/hose Ass'y Slide " Front " Rear Snap-Tite 42" Snap-Tite 24" Item Part No. Description O-RING, FLUORSILICONE O-RING, SILICONE DIAPHRAGM ASSEMBLY UCLIP, (2 REQ'D) RETAINER, SPRING (NOT USED WITH SOLID COVER) KNOB, BYPASS SPRING, QC, (2 REQ'D) BODY, BYPASS BYPASS INSERT ASSEMBLY HOSE ASSEMBLY SECOND STAGE FRONT 24" SNAP-TITE REAR 42" SNAP-TITE FRONT 24" REAR 42" SCREEN, BYPASS SPRING, PD O-RING, VITON (2 REQ'D) O-RING, SILICONE (2 REQ'D) QC BUTTON ASSEMBLY SLIDEBUTTON ASSEMBLY VALVE ASSEMBLY W/SHUTOFF HOUSING, REGULATOR COVER ASSEMBLY 19a SOLID COVER O-RING, SILICONE CHRISTO-LUBE LUBRICANT TAL 7012 (L) Rev

3 Firehawk Mask Mounted Regulator part number Push-To-Connect Item P/N Description a O-Ring, Fluorsilicone O-Ring, Silicone Diaphragm Assembly Uclip, (2 Req d) Retainer, Spring (not used with solid cover) Knob, Bypass Spring, QC, (2 Req d) Body, Bypass Bypass Insert Assembly Hose Ass y, 2nd Stg., Threaded Screen, Bypass Spring, PD O-Ring, Viton (2 Req d) O-Ring (2 Req d) QC Button Assembly Valve Assembly w/shutoff Housing, Regulator Cover Assembly 18a Solid Cover O-Ring Lubricant TAL 7012 (L) Rev

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5 SECOND STAGE REGULATOR DISASSEMBLY All repair procedures assume that the regulator is disassembled from the apparatus and facepiece. To do this: Be sure the cylinder valve is completely closed. Disconnect the regulator from the facepiece. Be sure nothing is blocking the regulator outlet. Crack the bypass valve to release any trapped air. If desired, disconnect the intermediate-pressure hose from the first stage regulator at the hose fitting using a 11/16" open-end wrench. Refer to the INTRODUC- TION Tab of this Binder for General Notes and required tools. 2. Lift up on the spring retainer to remove it from the regulator cover. Note: Refer to the appropriate illustrated parts lists for the apparatus being repaired. REMOVING THE REGULATOR COVER, SPRING, AND SPRING RETAINER REMOVING THE SPRING FROM THE SPRING RETAINER 1. Twist the spring clockwise to remove it from the spring retainer. Note: Do not stretch the spring. 1. Press and hold the housing buttons IN. Also, press the regulator housing retaining latches IN. REMOVING THE DIAPHRAGM 1. Roll the diaphragm edges out of the regulator housing groove. 2. Slide the diaphragm away from the red bypass handwheel and slide the diaphragm off the valve fork. DISASSEMBLING THE REGULATOR HOUSING O-RING 2. Pull firmly on the regulator cover to remove the cover, spring, and spring retainer from the regulator housing. 1. Remove the O-ring from regulator housing outlet. Be careful not to scratch the O-ring groove. DISASSEMBLING THE BYPASS AND HOSE W/SWIVEL 1. Remove the regulator cover, spring, and spring retainer. Note: DO NOT REMOVE THE DIAPHRAGM (option) Note: Do not stretch the spring. REMOVING THE SPRING AND SPRING RETAINER 1. Push the outside center (rubber) regulator cover IN. Note: Do not pull the spring to remove the spring retainer. 2. Use a small, flat-blade screwdriver to remove the U-clip from the regulator housing. 3. Remove the bypass and hose assembly from the regulator housing. 5 TAL 7012 (L) Rev

6 SECOND STAGE REGULATOR DISASSEMBLY 4. Remove the red bypass handwheel. Slide the handwheel back off the bypass body to reveal the U-clip in the bypass body. 9. Inspect the screen inside the bypass body. If dirty, all dirt and foreign matter must be removed before reusing the screen. If the screen is damaged, replace it. as follows: a. Insert a small screwdriver into the small hole side of the bypass body and push the screen out the large hole side of the bypass body. 5. Using a screwdriver, remove the U clip from the bypass body. INSPECTION OF THE VALVE FORK FOR PROPER HEIGHT Adjustment Wheel Fork 1. Press the top of the valve fork to check movement. 6. Remove the hose assembly by pulling the hose out of the bypass body. Valve Housing Valve Locking Tab Valve Support 2. Use the Height Gauge to verify the fork height setting. 7. Remove the hose assembly O-ring. Be careful not to scratch the O-ring groove. 8. Inspect the second groove of the hose swivel. If dirty, all dirt and foreign matter must be removed before reassembling the bypass body. TAL 7012 (L) Rev

7 SECOND STAGE REGULATOR REASSEMBLY Note: There are two different valve assemblies used in Firehawk regualtors. The correct gauge must be used for the valve assembly part number being inspected. Use the picture below to identify the correct gauge for the valve part number being inspected. Valve Assembly PN If your valve assembly looks like this: Height Gauge PN Use this height gauge ADJUSTING VALVE FORK HEIGHT FOR PROPER PERFORMANCE Normally the valve fork will not require adjustment and the valve should not be adjusted as long as it is within the acceptable range. If the valve fork is above or below the acceptable range, the valve must be adjusted to correct height of the fork. Depresssurize and remove the valve assembly from the regulator housing. Follow one of the following procedures to correct the height of the fork. Nominal height - Top of fork level with center of acceptable range. Valve Assembly PN If your valve assembly looks like this Height Gauge PN Use this height gauge Maximum Height - Top of fork level with top edge of acceptable range. 3. Center the Gauge between the center gap of the valve fork. The valve assembly must be held vertical and the fork must be not be prevented from moving freely. Acceptable range Minimum Height - Top of fork level with bottom edge of acceptable range. 4. The top of the valve fork must be within the acceptable range of the gauge. If the top of the valve fork is above the top edge of the acceptable range or if the top of the valve fork is below the bottom edge of the acceptable range the valve must be adjusted. Refer to the next section for the proper adjustment procedures. 7 TAL 7012 (L) Rev

8 SECOND STAGE REGULATOR REASSEMBLY ADJUSTMENT FOR VALVE FORK ABOVE THE MAXIMUM RANGE 3. Remove the U-clip from the regulator housing. Note: Use the bypass body as a tool to remove the bypass insert. Above maximum height Top of fork above top of acceptable range. 4. Insert the bypass body into the regulator housing bypass port. 1. Slide the adjustment when and valve housing slightly away from the valve support. This will free the adjustment wheel and allow it to rotate. The adjustment wheel cannot be turned unless the ribs on the wheel are free from engaging the locking tab. 2. Turn the adjustment wheel clockwise to lower the fork. 3. Slide the cylindrical valve housing back into place making sure that the valve lever and fork are not binding. The fork should move easily up and down when pushed. ADJUSTMENT FOR VALVE FORK IF BELOW THE MINIMUM RANGE 5. Turn the valve counter-clockwise to unthread the bypass insert from the valve. 6. Turn the regulator housing until the bypass insert drops out of the regulator housing. Below minimum height Top of fork is below acceptable range. 1. Slide the cylindrical valve housing slightly away from the valve support. This will free the adjustment wheel and allow it to rotate. The adjustment wheel cannot be turned unless the ribs on the wheel are free from engaging the locking tab. 2. Turn the adjustment wheel counterclockwise to raise the fork. 3. Slide the cylindrical valve housing back into place making sure that the valve lever and fork are not binding. The fork should be moved easily up and down when pushed. 7. To remove the valve, turn the regulator housing upside down, or lift the valve out of the regulator housing. 8. Replace all O-rings on the bypass insert and bypass body. DISASSEMBLING THE VALVE ASSEMBLY 1. Remove the regulator cover, spring, and spring retainer. 2. Remove the diaphragm. TAL 7012 (L) Rev

9 SECOND STAGE REGULATOR REASSEMBLY DISASSEMBLING THE REGULATOR HOUSING QC BUTTON AND SLIDE BUTTON INSTALLATION Installing Spring into the New Solid Regulator Cover Note: New Solid Regulator Cover does not use a spring retainer. 1. Remove the old O- rings. Be careful not to damage the O-ring seal area. 1. Insert old spring into solid cover 2. Pull on the buttons to remove them from the regulator housing. Be careful not to lose the spring. REASSEMBLING THE DIAPHRAGM a. Sliding spring over finger, insert spring and finger into the inside of solid cover. 2. Attach last coil of spring over the cover s hooks 1. Slide the diaphragm knob into the valve fork slot, then slide the diaphragm toward the red bypass handwheel. a. Holding the spring centered in the solid cover with finger, insert thumb of other hand down along the inside of cover to the bottom of spring. 2. Roll the diaphragm edges over the regulator housing groove. b. Slip the last coil of spring over each of the three (3) molded hooks at the bottom of cover. Removing Spring from Spring Retainer 1. Twist spring (clockwise) out of spring retainer. Note: Do not stretch the spring Removing Diaphragm Assembly 1. Roll diaphragm edges out of regulator housing groove. 2. Slide diaphragm away from red bypass handwheel and slide the diaphragm off the valve fork. c. Ensure that the last coil of the spring is engaged over each of the three (3) molded hooks. Double check proper engagement of solid cover spring by lifting on spring to ensure that the spring is securely attached to the regulator cover. Do not stretch the spring. Failure to follow this warning may result in serious personal injury or death. 9 TAL 7012 (L) Rev

10 SECOND STAGE REGULATOR REASSEMBLY 3. Push regulator cover and spring onto regulator housing. Double check proper engagement by lifting on regulator cover to ensure that the regulator cover is securely attached to the regulator housing. Failure to follow this warning may result in serious personal injury or death. 4. Roll a new O-ring into the first groove of the hose swivel. REASSEMBLING THE REGULATOR COVER 1. To install the spring in the retainer, press the spring s last coil over the retainer hooks. 2. Push the spring retainer over the regulator cover center stem. 3. Lift the spring retainer to check that the spring and retainer are engaged properly. 4. Push the regulator cover, spring, and spring retainer on the regulator housing. 5. Apply a thin film of lubricant (P/N ) into the second groove of the hose swivel. 6. Insert the swivel into the bypass body. Pull on the regulator cover to be sure the regulator cover and regulator housing are secure. REASSEMBLING THE REGULATOR HOUSING O-RING 1. Apply a light film of lubricant to the new O-ring. 2. Roll the new O-ring over the end of the regulator housing outlet and seat it into the O-ring groove. If the O-ring is not seated, it can cause an air leak. 7. Slide the U-clip through the bypass body. The U-clip should slide through the bypass body freely. REASSEMBLING THE BYPASS AND HOSE ASSEMBLY 1. Apply a light film of lubricant to all O- rings. 2. Roll a new O-ring into the first groove of the bypass body. 3. Insert the new screen (if removed). Insert screen into the large hole (hose swivel) side of the bypass body. Be careful not to damage the screen. Make sure the screen is flat inside the body. 8. Slide the red bypass handwheel over the bypass body. The handwheel hex lines up with the handwheel. 9. Ensure that the hose with swivel moves freely. TAL 7012 (L) Rev

11 SECOND STAGE REGULATOR REASSEMBLY 10. Insert the bypass body and hose assembly into the regulator housing so that the bypass body tabs are lined up with the slots in the bypass insert. 6. Insert the U-clip into the regulator housing. 11. Slide the U clip through the regulator housing. The U-clip should slide through the regulator housing freely. REASSEMBLING THE VALVE ASSEMBLY 1. Insert the valve into the regulator housing -- valve fork slot facing up and away from the bypass port. 2. Push the valve into the regulator housing. 3. Insert the bypass insert into the bypass port -- slot facing out. 7. Replace the diaphragm. 8. Replace the spring retainer, spring, and regulator cover. 9. Check the valve assembly calibration. (See Inspection for Valve Fork section.) 10. Flow-Test the SCBA (see the TESTER section of this Binder). REASSEMBLING THE REGULATOR HOUSING QC BUTTON AND SLIDE BUTTONS 1. Apply a light film of lubricant to the new O-rings. 2. Install new O-rings on the button s post. Note: With the red bypass handwheel facing you and the cap facing up, the slide button is to the left and the housing button is to the right. 3. Install the spring. Align the buttons. 4. Push firmly on the buttons, install the post O-ring on the inside of the regulator housing. 5. Double-check proper engagement by pulling on the buttons to ensure that they are securely attached to the regulator. 4. Use the bypass body to thread the bypass insert into the valve. Hand-tighten only. Note: If the bypass insert does not thread into valve assembly easily, the valve assembly is not aligned in the regulator housing properly. Ensure that the valve assembly is fully seated in the regulator housing. 5. Insert the hose assembly and bypass body into the regulator housing. 11 TAL 7012 (L) Rev